T-shirt Under Armour Siro Ss. Men's Short sleeve tee in a free cut from the original Threadborne Siro material, which is highly elastic without the use of elastomers, extremely lightweight and breathable. The materials used dissipates moisture and dries faster. With Anti-Odor technology that prevents the growth of odour-causing bacteria, you stay fresh longer. Simple Under Armour design with a small logo. Technology: Moisture Transport System (Wicks sweat away from your body to the surface of your clothes, which makes it easier to dry and keeps you longer), Anti-Odor (keeps the upper fresh by preventing the growth of bacteria causing odor), Threadborne SIRO (the material is designed for Adaptation to your movement – high levels of elasticity, light, fast dry and does not stick). Material: 100% Polyester